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---
id: 5e9a093a74c4063ca6f7c15c
title: Pandas Creating Columns
challengeType: 11
isHidden: true
videoId: _sSo2XZoB3E
---
## Description
<section id='description'>
</section>
## Tests
<section id='tests'>
```yml
question:
text: |
What code would add a "Certificates per month" column to the `certificates_earned` DataFrame like the one below?:
```
Certificates Time (in months) Certificates per month
Tom 8 16 0.50
Kris 2 5 0.40
Ahmad 5 9 0.56
Beau 6 12 0.50
```
answers:
- |
```py
certificates_earned['Certificates'] /
certificates_earned['Time (in months)']
```
- |
```py
certificates_earned['Certificates per month'] = round(
certificates_earned['Certificates'] /
certificates_earned['Time (in months)']
)
```
- |
```py
certificates_earned['Certificates per month'] = round(
certificates_earned['Certificates'] /
certificates_earned['Time (in months)'], 2
)
```
solution: 3
```
</section>